/Engine/Source/Runtime/Engine/Public/AnimationUtils.h
Perturbs the bone(s) associated with each track in turn, measuring the maximum error introduced in end effectors as a result
static void TallyErrorsFromPerturbation ( const [FCompressibleAnimData](API\Runtime\Engine\Animation\FCompressibleAnimData) & CompressibleAnimData, int32 NumTracks, const FVector & PositionNudge, const FQuat & RotationNudge, const FVector & ScaleNudge, [TArray](API\Runtime\Core\Containers\TArray)< [FAnimPerturbationError](API\Runtime\Engine\FAnimPerturbationError) > & InducedErrors )